Internet Explorer retrieves empty data with jQuery ajax()

Question

I'm using jQuery Address together with WordPress (latest vers.) and while trying to call in data from single.php via ajax() I get an empty string in return using Internet Explorer. This seems to be the case for all versions of the browser. The ajax call gets a "success" response but there's nothing parsed onto the data object. The function works perfect in all other browsers (surprise...).

Ajax call -

$.ajax({
    url: url, // The var url is just a short code, not an absolute URL, e.g. "motorola"
    contentType: 'text/html; charset=utf-8',
    type: 'GET',
    dataType: 'html',
    cache: false,
    success: function(data) {
        alert("data received");
        $('#display').append(data);
    }
});

WordPress single.php -

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<?php $id = get_post_thumbnail_id(get_the_ID()); ?>
<div class="navigation">
    <a class="next-image" href="#"></a>
    <a class="prev-image" href="#"></a>
</div>
<div class="slideshow">
    <ul>
    <?php get_images('large','0','0'); ?>
    </ul>
</div>
<div class="desc-left">
    <p><strong>Client:</strong> <?php the_title(); ?><br><strong>Type of work:</strong> <?php $categories = get_the_category(); $categoryList; foreach($categories as $name) { $categoryList .= $name->cat_name . ' / '; } $categoryList = substr($categoryList, 0, -3); echo $categoryList; ?></p>
</div>
<div class="desc-right"><?php the_content(); ?></div>
<?php endwhile; endif; ?>

I've tried so many settings now it seems I might have to take another approach on this. Should I perhaps use some other method?